diff --git a/slate/slate.py b/slate/slate.py
index 6d2978a..e5ae6d9 100644
--- a/slate/slate.py
+++ b/slate/slate.py
@@ -83,7 +83,7 @@ class Slate():
 
     def expand_vars(self, string, **kwargs):
         if isinstance(string, str):
-            return string.format(**kwargs)
+            return string.format(**kwargs, rand=int(random.random()*99999999))
         return string
 
     def apply_nested(self, d, f):